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Cookies on this site

To make full use of some of the features on this website, your web browser will need to accept cookies.

This page lists the cookies which may be sent to your browser by this site and what we use each cookie for. Please bear in mind that if you disable cookies in your browser, certain features of this website cannot be provided to you.

Cookies used on this site

Below is a list of the main cookies used by this site and what each is used for:

Cookie Name

What we use them for

__utma, __utmt, __utmb, __utmc, __utmz, __utmv, _ga, _gid, _gat, _gac_<property-id>, _gac_gb_<container-id> , _gcl_au 

These are cookies used by Google Analytics, more information can be found on Google's cookie usage page.

  • Determine which domain to measure
  • Distinguish unique users
  • Throttle the request rate
  • Remember the number and time of previous visits
  • Remember traffic source information
  • Determine the start and end of a session
  • Remember the value of visitor-level custom variables


This is an anti-forgery cookie set by web applications built using Microsoft .NET based technologies. It is designed to stop unauthorised posting of content to a website. It holds no information about the user and is destroyed on closing the browser. 
ASP.NET_SessionId   Used to store information to enhance the overall user experience of this site. This site may use this cookie to remember certain settings and where a user been in the site. 
_fbp, _fbc   Cookies used by Meta to track user session information.
_gaexp  Used by Google Optimize to determine a user's inclusion in a test and the expiry of tests a user has been included in.
zab, zps, zft Used by Zoho to determine a user's inclusion in a test and the expiry of tests a user has been included in.
Tran_id  Used to identify unique transactions on our website.

lightbox-[lightbox ID]

Used to remember if a site user has closed a lightbox.




Used to collect statistics about site usage, more information can be found on SiteImprove's cookie page.


Used by our Cookie Management Tool to remember your cookie preferences.



Used to serve our transactional pages and keep track of sessions across pages. More information can be found on Engaging Networks' cookies page.



Used by Stripe to prevent fraudulent payments. More information can be found on Stripe's cookies page.

More information about cookies

If you wish to learn more about cookies, please visit


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If you have any further questions regarding this, or any other matter, please get in touch with us at We aim to respond to all queries within two working days. However, due to the high volume of correspondence that we receive, it may occasionally take a little longer. Please do bear with us if this is the case. Alternatively, if your query is urgent, you can contact our Supporter Engagement Team on +44 (0)1483 521 953 (lines open Monday to Friday 9am to 5pm).